What is my IP? - Find out what your IP is. Do not hesitate to open wimip.
ipinfo.io - Simple IP address information.
geoiplookup.net - (IPv4 only) Online tool to get accurate IP address information
FindSiteIP.com - Website IP Address & Host Name Locator
TrueIP - TrueIP is a small program that runs in the system tray, monitoring your IP address(es).
IPTools - The "IP Tools" is powerful and handy application for network analyzing.